There are 2 things taught to us:variables(litersls ) and constants .(adsbygoogle = window.adsbygoogle || []).push({});

If we let a value 'a' as a constant ,meaning it would remain unchanged and also it is a set of real numbers .

If we take 'x' as a variable, meaning it can change and it is also a set of real nos.

For ex. Lim (x>a) x = a ,a:fixed value ,any value from end to end, but still it is not getting clear to me about 'x'?? If it does change then w.r.t to what ?

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# B Definition of a variable?

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